How do see fluids through glass (Eevee)?
If you use the Glass node you need to enable the following options :

Render panel &gt; Screen Space Reflection
Material panel &gt; Settings &gt; Blend Mode &gt; Alpha Blend
Material panel &gt; Settings &gt; Screen Space Refraction

There is a limitation for the moment in Eevee: You can't see an object that is in Blende Mode &gt; Alpha Blend through an object that has a Glass material, as you can see here, object 2 is not visible:

If you give object 1 a bit of transparency and therefore decrease its Glass value, you kind of get around the problem (you can also get rid of the Glass node and find another way to simulate glass, like a mix bewteen Glossy and Transparent):